#include<stdio.h>
#include<unistd.h>
int main()
{
  pid_t id=fork();
  if(id<0)
  {
  perror("fork");
  return 1;
  }
  else if(id==0)
  {
  while(1){
    printf("I'child,pid:%d,father_pid:%d\n",getpid(),getppid());
	sleep(1);
    }
  }
  else{
  while(1){
    printf("I'father,pid:%d,father_pid:%d\n",getpid(),getppid());
	sleep(3);
   }
  
  }

return 0;
}
